thermophilic followed by mesophilic set up. Indvidual optimum OLR for thermo and meso. As per literature review, Thermophilic olr is 5-8kg/m3/day and for mesophilic it is 3-5 kg vss/l /day
Depends on what is your substrate type. And the OLR you mentioned is not for thermophillic followed by mesophillic systems.
And are you a co-worker of Abhijeet Mairal ? Because he was also asking for sometime like your question, but i am not sure why any one would like to operate mesophillic reactors followed by thermophillic reactors?
Yes, as mentioned, the optimum OLR is not a fixed parameter. It depends on the type of substrate chosen and the characteristics of wastewater. Infact, this research part is discussed in many papers for many types of wastewater. That too, for combined situation of Thermophilic and Mesophilic bacteria, the OLR has to be tried individually.
Dear abhijit singh,
I am talking about separating the biochemical reactions (i.e hydrolysis, acidogenesis, acetogenesis and methanogenesis). And set up I am asking is thermophilic followed by mesophilic. In one-stage digestion all the microbiological phases of anaerobic digestion occur in one tank. In two-stage digestion different microbial phases can be separated.
The advantage of a two stage digestion process in AD is the possible enrichment of different bacteria in each digester which will increase the stability and allows higher OLR with shorter HRT than convetional single stage and also overall biogas yield will be high.
But to design such a set up we need to have a idea about the OLR we can vary for pilot plant set up.
Dear Suneeth Kumar Saragur,
Thank you for your response. Actually we are thinking about food waste and agricultural waste as feed (may be codigestion or not) (mixed with water in a proportion to make slurry).
Please read this and get a basic idea about the microbiology of AD. Its not easy as you think/describe. And when you say food waste, its community structure is different than what you would need for agricultural waste and also for co-digestion. So, designing would not work with "may be".
Hi Arnab Sarkar,
The OLR is to determined by the type of waste material(substrate), the the seed culture and also on the rate difference of the you two-phase process. Whatever might be case, to reach and operate stably at the maximum OLR, you have to have a period of acclimatization (adoptation) of the seed culture with the intended waste matter, and then you will get your optimum operating OLR, under your operating conditions. Good luck.
Many thanks for your valuable comments. As mentioned, OLR is dependent on the several factors (substrate type, temperature, pH, ...)and is not a fixed parameter. We worked on composting leachate, industrial wastewater, sludge,...and We achieved different results. Thanks
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